A nonagon is a closed shape that has nine sides. If it is a regular nonagon, all nine sides are the same length, and all the angles are equal.
Know MoreThe sum of the interior angles of a nonagon is 1260 degrees. If it is a regular nonagon, then all nine angles have the same measurement of 140 degrees.
The term "nonagon" was coined during the 17th century from a combination of words. It begins with the Latin word "nonus," which means "nine." The last part of the word "gon" is patterned after Latin and Greek words meaning "angle. " Literally translated, "nonagon" means "nine angles."
Learn MoreThere are four triangular faces on a tetrahedron. A face describes an individual surface on an object. On the tetrahedron, people can only see three of the four faces.
Full Answer >In geometry, a shape with five sides is called a pentagon. A regular pentagon has five sides of equal length, as well as five equal angles. A standard "STOP" sign in the US is a regular pentagon, as is the Pentagon building in the District of Columbia.
Full Answer >A rectangle is a quadrilateral that has four sides. In a rectangle, the opposite sides are of equal length and also parallel. Because of this, a rectangle is also a parallelogram.
Full Answer >Mathisfun.com states that an irregular polygon is a polygon that does not have all sides equal and all angles equal. There is no specific term for a polygon that has four completely unequal sides.
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